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Comprehensive income - Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 28,525 $ 28,424 $ 29,027 $ 26,957
Other comprehensive income (loss), net of Tax, Portion attributable to parent 62 524 441 432
Ending balance 28,728 28,876 28,728 28,876
AOCI Attributable to Parent        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, attributable to parent, beginning balance 289 (736) (219) (616)
Beginning balance (74) 185 55 157
Beginning balance 215 (551) (164) (459)
Other comprehensive income (loss) before reclassifications: 64 600 490 284
Other comprehensive income (loss) before reclassifications, tax (18) (150) (126) (72)
OCI, before reclassifications, net of tax, attributable to parent 46 450 364 212
Total other comprehensive income (loss) 84 700 592 580
Deferred income taxes and credits (22) (176) (151) (148)
Other comprehensive income (loss), net of Tax, Portion attributable to parent 62 524 441 432
Equity, attributable to parent, ending balance 373 (36) 373 (36)
Ending balance (96) 9 (96) 9
Ending balance 277 (27) 277 (27)
Investment Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, attributable to parent, beginning balance 82 (239) (205) (251)
Beginning balance 61 (179) (153) (187)
Other comprehensive income (loss) before reclassifications: 81 308 368 307
Other comprehensive income (loss) before reclassifications, tax (21) (78) (94) (78)
OCI, before reclassifications, net of tax, attributable to parent 60 230 274 229
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income:       13
Reclassification from AOCI, current period, tax       (4)
Reclassification from AOCI, current period, net of tax, attributable to parent       9
Total other comprehensive income (loss) 81 308 368 320
Other comprehensive income (loss), net of Tax, Portion attributable to parent 60 230 274 238
Equity, attributable to parent, ending balance 163 69 163 69
Ending balance 121 51 121 51
Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, attributable to parent, beginning balance 85 (330) (135) (203)
Beginning balance 63 (246) (101) (151)
Other comprehensive income (loss) before reclassifications: (16) 287 118 (26)
Other comprehensive income (loss) before reclassifications, tax 3 (71) (31) 7
OCI, before reclassifications, net of tax, attributable to parent (13) 216 87 (19)
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: 22 102 108 288
Reclassification from AOCI, current period, tax (4) (27) (26) (73)
Reclassification from AOCI, current period, net of tax, attributable to parent 18 75 82 215
Total other comprehensive income (loss) 6 389 226 262
Other comprehensive income (loss), net of Tax, Portion attributable to parent 5 291 169 196
Equity, attributable to parent, ending balance 91 59 91 59
Ending balance 68 45 68 45
Defined Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, attributable to parent, beginning balance 127 (158) 131 (155)
Beginning balance 95 (118) 98 (115)
Other comprehensive income (loss) before reclassifications: 0 0 0 0
Total other comprehensive income (loss) (2) (2) (6) (5)
Other comprehensive income (loss), net of Tax, Portion attributable to parent (2) (1) (5) (4)
Equity, attributable to parent, ending balance 125 (160) 125 (160)
Ending balance 93 (119) 93 (119)
Prior Service Credit        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: (2) (2) (6) (5)
Reclassification from AOCI, current period, tax 0 1 1 1
Reclassification from AOCI, current period, net of tax, attributable to parent (2) (1) (5) (4)
Other        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Equity, attributable to parent, beginning balance (5) (9) (10) (7)
Beginning balance (4) (8) (8) (6)
Other comprehensive income (loss) before reclassifications: (1) 5 4 3
Other comprehensive income (loss) before reclassifications, tax 0 (1) (1) (1)
OCI, before reclassifications, net of tax, attributable to parent (1) 4 3 2
Total other comprehensive income (loss) (1) 5 4 3
Other comprehensive income (loss), net of Tax, Portion attributable to parent (1) 4 3 2
Equity, attributable to parent, ending balance (6) (4) (6) (4)
Ending balance $ (5) $ (4) $ (5) $ (4)